Electric heating element



Nov. 1,7 1925 y O. C. TRAUTMAN ELECTRIC HEATING ELEMENT Filed April 2. 1924 Patented Nov. l?, 1925.

il ihm millennio nna'rme mentener.

application filed April 2, 1924;' ASerial No. 703,649.'

.To aZZ whom il? may concern:

Be it known that ll @solari C. TRAUM/IAN, aV citizen of the United States 4of America, and at resident of Lakewood, ijn the county of Cuyahoga and, State of Ohio, have invented certain new and useful improvements in Electric Heating Elements, oir' which the following is a full, clear, and exact descripw tion. l

This invention relates to electric furnaces and has for its object the provision of an im proved structure for supporting the electric resistanceelements. It is Well known that these elements are sometimes pushed to a high degree o temperature which is in. n'rions to the surroundings both by reason of such temperatureand of the expansion produced thereby; and it is also well known that nearly ellv the' substances' which are both electrically resistant and sulliciently refractory to be employed as supports and housings at such temperatures are also brittie, nonqnetellio substances which are im.- possible to be fashioned into complicated or intricate shapes and which cannot easily be Worked into any shape but must be capable of immediate molding. The objects oi' my invention are the provision of o resistor support of such-character that both the resistor and the support can be readilyi'ormed out of material customarily used for vthe purpose and shall enable free expansion and conti-ad tion relative to each other; the provision of a support which can readily be .molded out of customary refractory .substances and which shall be free from intricate or dillicult shapes and, possess a. maximum of strength both hot und cold; While other objects and advantages oit the invention ywill become up parent as the description proceeds. u

In the drawings accompanyingand forniing at part oi this application Fig. l is a side elevation of a resistance element cm bodying my improvements; Fig. 2 is a. see tion on the line 2-2 of Fig. l; Fig. 3 is a horizontal section on the line 3-3 of Fig. l; Fig. l is a side elevation showing' av slightly diderent design of support; Fig. 5 a sectional view of the-parts shown in Fig. l; Fig. 6 is n sectional View of another type of element; Fig. 'i' illustrates 'one mode ot mounting the last named element in a tur nace; Fig. 8 illustrates a mode of mounting the first described type of element; and Fig'. 9 is a. horizontal sectional view corresponding to the line 9-9 of Fig. 6.

In Figs. l to 3 of the drawings l vhave shown an elongated narrow piste l of any suitable refractory material such as alumina or carborundum combined with e suitable binder, having slots therein for the reception of supporting blocks which are preferably made ot' substantially the same refractory materiel. I have shown two slot arrangements, namely a row ot' open slots 3-3 along one edge and a row of keyhole slots 4- at a distance therefrom. It Awill be understood that either set of slots could under certain conditions be usedv to the exclusion of the other set, although preferably l employ both sets in cooperation to secure the resistor ele ment in place. Located in the open slots 3 are suitable blocks 5 here shown as l-l-shaped, the Width of each block being such as to lit snugly in its slot, and the notch 6 which is formed at one side of the block being of a Wlidth to receive snugly` the body of the p ate. block .isrpreferably made of a sutliciently greater Width to receive between it and the face of the plate the resistor element hereafter described. and the Width of the block are subject to considerable variation as it is immaterial to the operation ot the device Whether the resistors are supported below the edge of the plate as shown in. Fig. 2 or project above the same as shown in Fig. 5; provided only that a suitable head or heads be provided for the secure reception of the resistors. l ln Figs. 2 and 5 I have shown'resistors located at both sides of the plate, the notch? being made of sucient width for this purpose or formed with a head at each end, but my improvement equally comprehends fthe em-y ployment of only n single resistor as shown in Figs. 6 and Zfor which purpose the blocks 5a are shortened and the notches 71L narrowed accordingl For the lieyhole slots 4 l have shown other blocks 10, lilrcwiseo H-shape, the body portions 11 being of a. size and shape to fit snugly the narrow portion of the slot and the heads l2 being arranged to overlie thc 'faces of the plate l adjacent thereto. In case a resistor is to be mounted at each side ot' the plate as shown in Figs. 2, 3, 5, and 8 the length of each block l0 between the heads `is made sufficient to receive such elements at each side. If a` resistor4 is to be employed at only one side oi' the plate as shown 1n Figs. 6, 7, and 9 the blocks are shortened The slot 7 at' the opposite side of the l i The depth of the notch 3 .holding the i'eeistoi:

-resistor of a metal 'i'o siiiuous shape leuning adapted to lie snugly against t plete. l have shown the upper Aesistor :is suspended. over the liloe 5 :ind the dei'ieiiiling legs of the 'suine :is passing :.itljzioeiit 'to the keyhole slots #l iii suoli wise :is to be overlapped by the lie ls '12, the eombinefl action of the two sets of blocks liiiily iii platee while permitting free expaiision uml. eoiitieetioii and enabling ready emission of lient. it is immaterial Wlietliei` the keyhole Slots' eiitl open Slots, when both are employed, are 11i line `with eeel'i other oi' not. iii Fig. l l have shown there as staggered in 'which cese t'lie lxloolte'll ae loeeted inside the depending loops; in Fig. e have shown them es loeiited iii line with each other wherefore the blocks i0 lie between adjacent loops. lo oase resistor elements used :it both sides' of the plete, the two niej; be connected by 'ineens a horizontal loog) lo embracing one end of the plate, lmit any smole design of' eoineotion may be eiriployeti, Y

ln Geiler to suppoit oiy iiipioved elemente "l pi'eteably employ suitable blocks oi' sla s oliefireetoiy neetelhl mieli for eX- :ample es that employed iii the plates and blocks eli'eatlj; deei'zriloetl, the upper edges of the lest iiemed blocks or slzilve being iio'zelieil 4toi." 'the reception of, the plates which are tlieteloy suppoitecl iii ai. substen tiel upright position, The number of iiotelies employ-ed iii the siippoting loloek will (lopend upon the miii'ioei o eeistoi.' elements employed, entl, the width et `|hose not-@lies will depend upon the mode of fipplying such elements thereto. lo Fig. l. have Shown a. supporting block 20 :ieiiieet "m the side well 2l, of e furnace, seid block being foimecl :it its upper elige with. osiih glo slot L2 of :i width to i'eeeive the 'plete l very siiiigly. llie blocl: 2O lieiiiggloexitedl so :is to como between successive ilepenfliieg legis o'lf the resistor l?. ln Fig, @i leve shown im elongate-il slab Q3 formell, iiiv its eppoi eilgge with ii plurality of spaeeilslote adopted for the reception of plural plates 'l wheiiehy liiitterv of these elet/'loes ziro'suppoi'ted meer each other for concentrated lientine. lo this ease 'l have shown the sloteI 24 ol: ai sullieient Wiiltl, to receive the plates-together with their resistors.

lt will be understood, that many changes ii detail een be made Within the Soope of i my inventive iclee; the most ili'ipoi-tent l ,g emy invention consiste of the em ploy/'nient o1 supporting devices of simple. oootoui' liiterittiiig by the use of eiiiiple uotelies, thereof-i enabling the iorolluetion olf the@ parte trom plastic ie'iiictoiy meteH virils with :i iimxiiiiiim ol: 'e.I und. avoid- Aiiie mm'iiilieriteil :xml trzie'le parts liehle to beeoiiie broken unifier the severe physical. conditions to which they ere sill)- jeeteil, while zit the ,Home 'lime peiii'iittirig the iieeessiiiy relative. expansion and con ti'iwtioii ot the parts. lty not materiel 1o the iiiimhei or ziii'migeineixt of these slots; oi' the number oi' :ii'i'eiigenieiit o1' shape o'l the resistors imi the iiiiiiiheiot' platee and eleiii'eii's emplwfeil either ,iii line oi: side by side,wliei'elfoi'oy l (lo not limit myself except :is specifically set lfoifth iii my several Claims.

Hui/'ing thus (leseiilmd my invention what 'l'.eleiiii is:

l. A resistor support comprising; il i'elimloiy 'plete having slots, :mili lilof'lis of iel'i'zietoiy material having slots to ioteitit 'with said first slots in dove/tailed relation :mil heads io i'ei'eive Vthe 'esistols. :2. A resistor support comprising :in eloiigrated plate ot ietiiiotoi'y iiiateiial having slots therein from side to side, and blocks of i'etizietoiy material adapted to lit in said slots und also having slots adapted to i 'e eeive portions ol said plete adjacent to said slots eziitl blocks also having heads lo holo. the resistors.

3. A resistor supyoi't comprising a unitary eloiigsiteil plete'oi i'ei'eetoiy materiel l'ivziv .ing slots at one eflge7 end blocks oit elfieetory i'xiotoiial zulztptetl to fit in seid slots zuid leaving lieacls to liolcl 'the resistors.

4, A resistoi` suppoit comprising en elongated plate oit' refractory material having slots it one edge, and blocks o refractory ziiziterizil. atl-opted to it in sziitl slots mil also having' slots adapted to receive said plate,

.said elote being so eviiitigefl that the plate' and blocks me mutually (lovetoilefl togethe, blocks also having heads to liolfl the resisto?? elements;

A iesistoil support oompiieii'i nii elonf gated plate of i'efioetoiy Bietet-inl litfiviiig keyhole elote therein :mil lblocks ol1 refractory msiteiiel lim/ing enliiiggod ei'ids to pass through the lzugei' parte o suitl slots end reduced 1@ediles to lit the iiiiiiow parte el seid slotsa eeitein euhm-geil ends ooiistitiit 'ing .attachmentstoiresistors.'-

iiesietor euppoit eon'ipiisiiig on elongated plate ot' refractory iiiatei'iiil having Slot/s at olie el :md blocks ot iel'i-eeorjif meteyiel yo, to lit iii seid slots seiil plate also having keyhole slots et e distance *from seid lli-st slots and other 'rei'zieoiv blocks adopted to fit, ee'icl keyhole slots ull said liloeke leaving slots aflaptefl to ilovetail with seid. plete enel, oleo` having 'liezifls zulepteel to sind hold the iesistoif.

7, A eeistoesupport eoiiipiisiiie' :in elongated plete o? ii ,'i.`iz. :toi v materiel having slot-s at one loogly, amil wl a ich are:y

zuid keyhole Slots iii its' terial adapted to interit with said slots and overlapping apart ofthe han adjaeent'there to engage the resistor.

8. A resistor support comprising a refractory plate ha: ing slots, blocks of refractory material interlock'ed with said slots and supporting a resistor, and a supporting block of Arefractory material positioned croeswise of'fsaid plate and having an upwardly opening slot receiving said plate.

9. An electric resistance heating element comprising a vrefractory plate having slots therein, a si'nuous looped conductor located adjacent the face of said' platejwitha loop adjacent each slot, and a block of refractory material interlocked with each slot and having a head engaging the adjacent loop, each block being slotted for dovetailed engagement with said plate.

l0. An-electric resistance heating element comprisin .a narrow refractory plate having space 'open slots at one edge and similarly spaced keyhole slots near the other edge, means supporting said plate edgewse with said open slots uppermost, refractory blocks in said slots and fitted thereto and to; said blocks havin heads spaced from the face of the plate, an a sinu'ous looped resism tor engaging said heads. 4

11. A resistor 'support for electric heat- ,.ing elements comp'risingl a narrow refractory plate having slots t erein from sideto side, and refractory blocks fitting in said' slots and overlapping a part of the plate adjacent thereto on bot-h faces, said blocks having heads adapted to receive 'a resistor.

12..A.n electric lfurnace comprising the combination with a refractory shell of a refractory. blockl therein having an upwardly opening slot,V a refractory plate mounted -edgcwise in said slot and itselt' having slots extending from side to side, refractory blocks iitting in said last' slots and themselves also slotted to dovetail with the late, and resistors carried. by said p bloc s and alongside the face of said plate.'

In testimonyv whereof, I hereunto afx my signature.

SCAR C. TRAU'MAN. 

